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Distribution in correlation times for rotational diffusion of spin probes in polymers

1987; Wiley; Volume: 19; Issue: 2 Linguagem: Inglês

10.1002/pi.4980190206

1934-256X

G. Gordon Cameron, I.S. Miles, Anthony T. Bullock,

Material Properties and Processing

British Polymer JournalVolume 19, Issue 2 p. 129-134 Article Distribution in correlation times for rotational diffusion of spin probes in polymers G. Gordon Cameron, G. Gordon Cameron Department of Chemistry, University of Aberdeen, Aberdeen AB9 2UE, UKSearch for more papers by this authorIsabel S. Miles, Isabel S. Miles Department of Chemistry, University of Aberdeen, Aberdeen AB9 2UE, UKSearch for more papers by this authorAnthony T. Bullock, Corresponding Author Anthony T. Bullock Department of Chemistry, University of Aberdeen, Aberdeen AB9 2UE, UK‘Aldan’, Schoolhill, Ellon, Aberdeenshire AB4 9AJ, UKSearch for more papers by this author G. Gordon Cameron, G. Gordon Cameron Department of Chemistry, University of Aberdeen, Aberdeen AB9 2UE, UKSearch for more papers by this authorIsabel S. Miles, Isabel S. Miles Department of Chemistry, University of Aberdeen, Aberdeen AB9 2UE, UKSearch for more papers by this authorAnthony T. Bullock, Corresponding Author Anthony T. Bullock Department of Chemistry, University of Aberdeen, Aberdeen AB9 2UE, UK‘Aldan’, Schoolhill, Ellon, Aberdeenshire AB4 9AJ, UKSearch for more papers by this author First published: March 1987 https://doi.org/10.1002/pi.4980190206Citations: 29AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Abstract Electron spin resonance spectra of poly(vinyl acetate) (PVAc) and plasticised PVAc doped with nitroxide spin probes show a double-peak feature at temperatures immediately below T50 G. This can be explained on the basis that probe tumbling occurs with a distribution of correlation times τR arising from a distribution of free volume within the polymeric matrix. The two-component e.s.r. spectra arise because the distribution in τR of the probes straddles the value (c. 3 × 10−9 s) which marks the change-over from fast- to slow-motion spectra. The implications of the existence of a distribution of τR values for calculations based on the assumption of a single value are examined. It is concluded that when probe tumbling is slow the error in τR could be significant, but for rapid tumbling (motionally narrowed spectra) the error is likely to be insignificant. Citing Literature Volume19, Issue2March 1987Pages 129-134 RelatedInformation